Clamp



FIG. 1 is a front elevation view of a clamp embodying my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a perspective view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view.

The portions of the clamp shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a clamp, as shown and described. 